OO-S-256K/GEN
The configuration for the openings in the tops shall conform to the machine head manufacturer's requirements, and be appropriate for their intended
use. The tops shall be joined, planned, and sanded to a flat smooth surface. All surfaces shall be finished with one coat of a sealer conforming to TT-W-572, composition A. After 72-hours drying time, apply two coats of varnish conforming to MPI 28. All hardware and accessories required to mount the components including the stand shall be provided.
3.5.9 Head, mounting. The head of the sewing machine shall be mounted on or in the table as specified in the detail specification. Where mounting is in the table, the head shall be fully submerged in a recessed cut-out in the table top. The cloth plate of the head shall be flush with the top of the table. Insulating pads or bushings shall be provided between the bed of the head and table or mounting board.
3.5.10 Bobbin winder. A bobbin winder shall be provided to wind the bobbin for the sewing machine.
3.5.11 Lubricated, nonautomatically. Nonautomatically lubricated machines shall be provided with means for applying lubrication to bearings and frictional surfaces. Lubricating orifices may be identified by using the word "OIL" or high-lighting by contrasting color. Gears that are required to be packed with grease shall be covered.
3.5.12 Lubricated, automatically. Automatically lubricated machines shall be equipped with covered oil reservoirs and level gages. The reservoirs shall be sufficiently tightly covered to prevent oil from overflowing from machines that are to be furnished on ships or other moving vehicles. The oil shall be distributed to all frictional points during operation by necessary wicks, oil ducts, or direct contact by splashing. Means shall be provided to indicate that oil is circulating through when it is coming from reservoirs not readily visible. Oil in the sewing head shall return to the reservoir by siphon, wick, or capillary tube. An automatically lubricated machine may provide lubrication by other means for various parts of the machine head which are inaccessible for the automatic lubrication system.
3.5.13 Tension, adjustable. An adjustable tension arrangement shall be provided for each thread used by the sewing machine, and shall be
adjustable to the amount of tension required to sew stitches. The 301 and
401 stitch type machines shall be equipped with an automatic thread tension
release effective when the presser foot is raised. Guides for thread shall be polished to prevent fraying of thread.
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